Genealogy / Is there a list of names of who was in Poland's Anders army? [34]

I am not too sure how to proceed. My father was born in a polish refugee camp in Arusha Tanzania. His mother died and he was orphaned. I have his birth certificate with the name of his father who was serving in Anders Army at the time. Henryk Roskosnik. I have no other information about him. On the records also states his uncles name Aleksander Rein who was also serving in the Anders Army. How shall I proceed about finding out more information about the 2 of them? Any help would be appreciated.

Thanks in advance.